Preamp time........

OK, battery access.  no fiddly velcro bags like some folk have in their acoustics, proper battery box thank you very much.

measure twice, cut once, right?

rough cut with the dremel

tidy with a stanley knife

and there it goes.

Artec preamp.  Not the VERY cheapest on the internet, but close......

but they WORK! 

then cut the backplate to size.....

still need a few black screws to hold the battery box onto the backplate, but it's VERY nearly done!